Networks of exchange in the Indian Ocean in the period between 1200 and 1450 developed primarily because （A)Mongol control of the overland Silk Roads resulted in a need for safer routes. （B)Muslim converts in the region needed safe passage for the pilgrimage to Mecca. （C)Dutch and British joint-stock companies invested in larger and more powerful fleets. (D)environmental knowledge of wind and ocean patterns improved.

genetics is the study of how dna works, the methodologies defining the new recent technologies allow scientist to have a panoramic view of the entire dna landscape, especially how genomes interact with their environment, including off course, factors outside their organisms.

thus is very possible the existence of both scenarios, where populations of isolated individuals have different genetic traits, and share traits related to genetic mutation, due rats can easily travel overseas using human transport channels. so scientists could get a vast number of data, including human interaction, evolution of rodents, health development, spread of infections, development of new organisms, how genomes evolve in different environments and so on.

- a government ruled by the people, or assembly. officials monarchy - a single ruler like a king. over time some city-states, like athens would change governments. what this means is that all the citizens voted on all the laws.